Theia is often regarded as the Greek goddess of sight or the heavenly light that illuminated the world. Synonyms for the term Theia vary depending on context and usage. For instance, in mythology, Theia is often referred to as Euryphaessa, meaning "wide-shining." Similarly, Aurora, Selene, and Helios are other gods and goddesses associated with light and are sometimes used interchangeably with Theia. In scientific contexts, Theia may refer to a hypothetical planet that collided with Earth, which is sometimes called "Giant Impact Hypothesis," or "Big Splash." Additional synonyms for Theia include clarity, vision, brightness, radiance, luminosity, and illumination.